781378768378 has 8 divisors (see below), whose sum is σ = 1262227241268. Its totient is φ = 360636354624.

The previous prime is 781378768361. The next prime is 781378768393. The reversal of 781378768378 is 873867873187.

It can be written as a sum of positive squares in 2 ways, for example, as 767072933929 + 14305834449 = 875827^2 + 119607^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×781378768378² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781378768378.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15026514751 + ... + 15026514802.

Almost surely, 2^781378768378 is an apocalyptic number.

781378768378 is a deficient number, since it is larger than the sum of its proper divisors (480848472890).

781378768378 is a wasteful number, since it uses less digits than its factorization.

781378768378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30053029568.

The product of its digits is 531062784, while the sum is 73.

The spelling of 781378768378 in words is "seven hundred eighty-one billion, three hundred seventy-eight million, seven hundred sixty-eight thousand, three hundred seventy-eight".